Alert archive / Texas / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 280, NWS Shreveport, LA
NWS Shreveport, LA issued this severe thunderstorm warning at Jul 27, 2009, 1:18 AM CDT for Gregg County, Harrison County, Rusk County, Texas. It was in force for 42 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jul 27, 2009, 1:18 AM CDT (06:18 UTC)
- Expired
- Jul 27, 2009, 2:00 AM CDT
- In force
- 42 min
- Issued by
- NWS Shreveport, LA
- Area
- Storm-based polygon
Counties Gregg County, TX, Harrison County, TX, Rusk County, TX
The radar
The Shreveport radar (KSHV), 76 km from the middle of the area, began a volume at 06:20 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Lake Charles Mun, LA (KLCH), launched 00:00Z, 6.3 hours before the alert went out and 287 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 1798 J/kg
- Mixed-layer CIN
- -48 J/kg
- Mixed-layer LCL
- 849 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- -21 m²/s²
- 0-3 km storm-relative helicity
- -19 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.6
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Shreveport, LA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 26, 9:03 PM CDT, 4 hours 15 minutes earlier.
Area forecast discussion, Jul 26, 9:03 PM CDT, 4 hours 15 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SHREVEPORT LA 903 PM CDT SUN JUL 26 2009 .DISCUSSION... LOOKS LIKE THE THREAT FOR SEVERE WEATHER HAS DIMINISHED SOMEWHAT FOR THIS EVENING. HOWEVER...WITH THE ON GOING RAINFALL IN THE NORTHEAST PORTION OF THE CWA AND EXPECTED REDEVELPOMENT OF ADDITIONAL CONVECTION LATER TONIGHT AREA WIDE...THINK THE POPS SHOULD REMAIN AS IS. NOT PLANNING ANY CHANGES TO THE FORECAST AT THIS TIME. && .AVIATION... MAINLY VFR CONDITIONS WILL PERSIST THROUGH 12Z MONDAY. VCTS CONDITIONS WILL RETURN BY DAYBREAK ACROSS THE RED RIVER VALLEY FOLLOWED BY INCREASED CONVECTION ACROSS ALL AREA TERMINALS BY 18Z. LIGHT SOUTHERLY WINDS WILL PREVAIL THROUGH MUCH OF THE TERMINAL FORECAST PERIOD. HOWEVER...A COLD FRONT MAY BRING A WIND SHIFT FOR TXK TOWARD 00Z TUESDAY. /05/ && .PRELIMINARY POINT TEMPS/POPS... SHV 75 84 75 83 75 / 60 70 70 70 70 MLU 74 84 74 83 74 / 60 70 70 70 70 DEQ 73 83 71 81 71 / 60 70 70 70 70 TXK 73 83 72 81 72 / 60 70 70 70 70 ELD 73 83 72 81 73 / 60 70 70 70 70 TYR 76 84 75 85 75 / 60 70 70 70 70 GGG 76 84 75 85 75 / 60 70 70 70 70 LFK 76 87 75 87 75 / 50 60 70 70 70 && .SHV WATCHES/WARNINGS/ADVISORIES... AR...NONE. LA...NONE. OK...NONE. TX...NONE. && 14
Hazardous weather outlook, Jul 26, 10:39 AM CDT, 14 hours 39 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SHREVEPORT LA 1039 AM CDT SUN JUL 26 2009 ARZ050-051-059>061-070-071-OKZ077-TXZ096-097-108>112-271100- SEVIER-HOWARD-LITTLE RIVER-HEMPSTEAD-NEVADA-MILLER-LAFAYETTE- MCCURTAIN-RED RIVER-BOWIE-FRANKLIN-TITUS-CAMP-MORRIS-CASS- 1039 AM CDT SUN JUL 26 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHWEST ARKANSAS...SOUTHEAST OKLAHOMA AND NORTHEAST TEXAS. .DAY ONE...TODAY AND TONIGHT... SHOWERS AND THUNDERSTORMS ARE EXPECTED TO REDEVELOP LATER TODAY INTO THE OVERNIGHT HOURS ALONG A COLD FRONT WHICH WILL MOVE SOUTH TOWARDS THE INTERSTATE 30 CORRIDOR OF NORTHEAST TEXAS INTO SOUTHWEST ARKANSAS. THESE STORMS WILL HAVE THE CAPABILITY TO PRODUCE STRONG WIND GUSTS BUT THE PRIMARY THREAT WILL BE LOCALLY HEAVY RAINFALL... MAINLY LATE TONIGHT. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY... THE FRONTAL BOUNDARY IS EXPECTED TO STALL ACROSS THE REGION THROUGH THE UPCOMING WORK WEEK. UPPER LEVEL DISTURBANCES WILL BE MOVING PARALLEL TO THE FRONTAL BOUNDARY WHICH WILL RESULT IN PERIODS OF HEAVY RAINFALL THROUGHOUT THE WEEK. RAINFALL THROUGH THE WEEK COULD TOTAL FOUR TO EIGHT INCHES WHICH MEANS A FLOOD THREAT COULD DEVELOP ACROSS THE REGION. IN ADDITION TO THE FLOOD CONCERNS...SOME OF THESE STORMS COULD PRODUCE STRONG AND DAMAGING WIND GUSTS AS WELL. .SPOTTER INFORMATION STATEMENT... ACTIVATION OF STORM SPOTTERS MAY BE NEEDED IF AND WHEN ADDITIONAL THUNDERSTORM ACTIVITY DEVELOPS THROUGH TONIGHT. ARZ072-073-LAZ001>006-010>014-017>022-TXZ124>126-136>138-149>153- 165>167-271100- COLUMBIA-UNION AR-CADDO-BOSSIER-WEBSTER-CLAIBORNE-LINCOLN- UNION LA-DE SOTO-RED RIVER-BIENVILLE-JACKSON-OUACHITA-SABINE LA- NATCHITOCHES-WINN-GRANT-CALDWELL-LA SALLE-WOOD-UPSHUR-MARION- SMITH-GREGG-HARRISON-CHEROKEE-RUSK-PANOLA-NACOGDOCHES-SHELBY- ANGELINA-SAN AUGUSTINE-SABINE TX- 1039 AM CDT SUN JUL 26 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTH CENTRAL ARKANSAS...SOUTHWEST ARKANSAS...NORTH CENTRAL LOUISIANA... NORTHWEST LOUISIANA...EAST TEXAS AND NORTHEAST TEXAS. .DAY ONE...TODAY AND TONIGHT... SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS WILL CONTINUE THROUGH THE DAY ACROSS THE REGION. THE ATMOSPHERE IS BECOMING VERY UNSTABLE ACROSS DEEP EAST TEXAS INTO WEST CENTRAL AND EAST CENTRAL LOUISIANA. WITH THE STORMS SHIFTING SOUTHWARD TOWARDS THESE REGIONS LATER TODAY...STRONG TO SEVERE THUNDERSTORMS WILL BE POSSIBLE WITH THE PRIMARY CONCERN BEING DAMAGING WIND GUSTS. ALONG WITH THE WIND THREAT...LOCALLY HEAVY RAINFALL WILL BE POSSIBLE AS WELL. ADDITIONAL THUNDERSTORM ACTIVITY WILL BE POSSIBLE AS WE TRANSITION INTO THE OVERNIGHT HOURS AS A FRONTAL BOUNDARY IS EXPECTED TO STALL JUST NORTH OF THE REGION. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY... THE FRONTAL BOUNDARY IS EXPECTED TO STALL ACROSS THE REGION THROUGH THE UPCOMING WORK WEEK. UPPER LEVEL DISTURBANCES WILL BE MOVING PARALLEL TO THE FRONTAL BOUNDARY WHICH WILL RESULT IN PERIODS OF HEAVY RAINFALL THROUGHOUT THE WEEK. RAINFALL THROUGH THE WEEK COULD TOTAL THREE TO SIX INCHES...ESPECIALLY ALONG THE INTERSTATE 20 CORRIDOR OF NORTHEAST TEXAS INTO NORTHWEST AND NORTH CENTRAL LOUISIANA. THEREFORE...A FLOOD THREAT COULD DEVELOP ACROSS THE REGION LATER IN THE WEEK. IN ADDITION TO THE FLOOD CONCERNS...SOME OF THESE STORMS COULD PRODUCE STRONG AND DAMAGING WIND GUSTS AS WELL. .SPOTTER INFORMATION STATEMENT... ACTIVATION OF STORM SPOTTERS MAY BE NEEDED LATER TODAY ACROSS PORTIONS OF THE REGION. 13
In the hours before
Special weather statement, Jul 26, 7:38 PM CDT, 5 hours 40 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
738 PM CDT SUN JUL 26 2009
ARZ050-051-270145-
HOWARD-SEVIER-
738 PM CDT SUN JUL 26 2009
...SIGNIFICANT WEATHER ALERT...
THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A SIGNIFICANT
WEATHER ALERT...EFFECTIVE UNTIL 845 PM CDT...FOR THE FOLLOWING
COUNTIES...
IN SOUTHWEST ARKANSAS...
SEVIER AND HOWARD...
INCLUDING THE FOLLOWING LOCATIONS...
ATHENS...GILLHAM AND UMPIRE...
AT 737 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS ARE TRACKING
A STRONG THUNDERSTORM 8 MILES NORTHEAST OF WICKES...OR 11 MILES
NORTHWEST OF UMPIRE...MOVING SOUTH AT 20 MPH.
DIME SIZE HAIL...AND WINDS AROUND 55 MPH ARE EXPECTED WITH THIS
STORM.
05Special weather statement, Jul 26, 10:49 PM CDT, 2 hours 29 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1049 PM CDT SUN JUL 26 2009
TXZ124-136-270430-
SMITH-WOOD-
1049 PM CDT SUN JUL 26 2009
...SIGNIFICANT WEATHER ALERT...
THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A SIGNIFICANT
WEATHER ALERT...EFFECTIVE UNTIL 1130 PM CDT...FOR THE FOLLOWING
COUNTIES...
IN NORTHEAST TEXAS...
WOOD AND SMITH...
INCLUDING THE FOLLOWING LOCATIONS...
GOLDEN...HAINESVILLE...HOARD...LINDALE...MINEOLA...PLEASANT
GROVE...QUITMAN AND TYLER...
AT 1048 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS ARE TRACKING
A LINE OF STRONG THUNDERSTORMS WITH THE STRONGEST CONVECTION 5 MILES
NORTHWEST OF GRAND SALINE...OR 17 MILES WEST OF MINEOLA...MOVING
EAST AT 20 MPH.
DIME SIZE HAIL...INTENSE LIGHTNING...AND WINDS AROUND 40 MPH ARE
EXPECTED WITH THIS STORM.
05Special weather statement, Jul 27, 1:15 AM CDT, 3 minutes before
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</html>The office that day
Everything else NWS Shreveport, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 27, 3:36 PM CDT | Flash Flood Watch | SHV | Angelina, Bowie, Camp, Cass, Cherokee, Franklin and 15 more | 29 hr |
Nearby
Severe Thunderstorm Warnings in Texas, 2009Every severe thunderstorm warning in 2009
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.